module_win32.cpp

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//-----------------------------------------------------------------------------
// Project     : VST SDK
//
// Category    : Helpers
// Filename    : public.sdk/source/vst/hosting/module_win32.cpp
// Created by  : Steinberg, 08/2016
// Description : hosting module classes (win32 implementation)
//
//-----------------------------------------------------------------------------
// LICENSE
// (c) 2021, Steinberg Media Technologies GmbH, All Rights Reserved
//-----------------------------------------------------------------------------
// Redistribution and use in source and binary forms, with or without modification,
// are permitted provided that the following conditions are met:
//
//   * Redistributions of source code must retain the above copyright notice,
//     this list of conditions and the following disclaimer.
//   * Redistributions in binary form must reproduce the above copyright notice,
//     this list of conditions and the following disclaimer in the documentation
//     and/or other materials provided with the distribution.
//   * Neither the name of the Steinberg Media Technologies nor the names of its
//     contributors may be used to endorse or promote products derived from this
//     software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
// ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
// WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
// IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
// INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
// BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
// LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
// OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE  OF THIS SOFTWARE, EVEN IF ADVISED
// OF THE POSSIBILITY OF SUCH DAMAGE.
//-----------------------------------------------------------------------------
 
#include "public.sdk/source/vst/utility/optional.h"
#include "public.sdk/source/vst/utility/stringconvert.h"
#include "public.sdk/source/vst/hosting/module.h"
 
#include <windows.h>
#include <shlobj.h>
 
#include <algorithm>
#include <iostream>
 
#if _HAS_CXX17 && defined(_MSC_VER)
#if __has_include(<filesystem>)
#define USE_FILESYSTEM 1
#elif __has_include(<experimental/filesystem>)
#define USE_FILESYSTEM 0
#endif
#else
#define USE_FILESYSTEM 0
#endif
 
#if USE_FILESYSTEM == 1
#include <filesystem>
namespace filesystem = std::filesystem;
#else
// The <experimental/filesystem> header is deprecated. It is superseded by the C++17 <filesystem>
// header. You can define _SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING to silence the
// warning, otherwise the build will fail in VS2020 16.3.0
#define _SILENCE_EXPERIMENTAL_FILESYSTEM_DEPRECATION_WARNING
#include <experimental/filesystem>
namespace filesystem = std::experimental::filesystem;
#endif
 
#pragma comment(lib, "Shell32")
 
//------------------------------------------------------------------------
extern "C" {
using InitModuleFunc = bool (PLUGIN_API*) ();
using ExitModuleFunc = bool (PLUGIN_API*) ();
}
 
//------------------------------------------------------------------------
namespace VST3 {
namespace Hosting {
 
//------------------------------------------------------------------------
namespace {
 
#if SMTG_OS_WINDOWS_ARM
#define USE_OLE 0
#if SMTG_PLATFORM_64
constexpr auto architectureString = "arm_64-win";
#else
constexpr auto architectureString = "arm-win";
#endif
#else
#define USE_OLE !USE_FILESYSTEM
#if SMTG_PLATFORM_64
constexpr auto architectureString = "x86_64-win";
#else
constexpr auto architectureString = "x86-win";
#endif
#endif
 
#if USE_OLE
//------------------------------------------------------------------------
struct Ole
{
   static Ole& instance ()
   {
      static Ole gInstance;
      return gInstance;
   }
 
private:
   Ole () { OleInitialize (nullptr); }
   ~Ole () { OleUninitialize (); }
};
#endif // USE_OLE
 
//------------------------------------------------------------------------
class VST3_API Win32Module : public Module
{
public:
   template <typename T>
   T getFunctionPointer (const char* name)
   {
      return reinterpret_cast<T> (GetProcAddress (mModule, name));
   }
 
   ~Win32Module () override
   {
      factory = PluginFactory (nullptr);
 
      if (mModule)
      {
         // ExitDll is optional
         if (auto dllExit = getFunctionPointer<ExitModuleFunc> ("ExitDll"))
            dllExit ();
 
         FreeLibrary ((HMODULE)mModule);
      }
   }
 
   bool load (const std::string& inPath, std::string& errorDescription) override
   {
      auto wideStr = StringConvert::convert (inPath);
      mModule = LoadLibraryW (reinterpret_cast<LPCWSTR> (wideStr.data ()));
      if (!mModule)
      {
         filesystem::path p (inPath);
         auto filename = p.filename ();
         p /= "Contents";
         p /= architectureString;
         p /= filename;
         wideStr = StringConvert::convert (p.string ());
         mModule = LoadLibraryW (reinterpret_cast<LPCWSTR> (wideStr.data ()));
         if (!mModule)
         {
            auto lastError = GetLastError ();
            LPVOID lpMessageBuffer;
            FormatMessageA (FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
                            nullptr, lastError, MAKELANGID (LANG_NEUTRAL, SUBLANG_DEFAULT),
                            (LPSTR)&lpMessageBuffer, 0, nullptr);
            errorDescription = "LoadLibray failed: " + std::string ((char*)lpMessageBuffer);
            LocalFree (lpMessageBuffer);
 
            return false;
         }
      }
      auto factoryProc = getFunctionPointer<GetFactoryProc> ("GetPluginFactory");
      if (!factoryProc)
      {
         errorDescription = "The dll does not export the required 'GetPluginFactory' function";
         return false;
      }
      // InitDll is optional
      auto dllEntry = getFunctionPointer<InitModuleFunc> ("InitDll");
      if (dllEntry && !dllEntry ())
      {
         errorDescription = "Calling 'InitDll' failed";
         return false;
      }
      auto f = Steinberg::FUnknownPtr<Steinberg::IPluginFactory> (owned (factoryProc ()));
      if (!f)
      {
         errorDescription = "Calling 'GetPluginFactory' returned nullptr";
         return false;
      }
      factory = PluginFactory (f);
      return true;
   }
 
   HINSTANCE mModule {nullptr};
};
 
//------------------------------------------------------------------------
bool checkVST3Package (filesystem::path& p)
{
   auto filename = p.filename ();
   p /= "Contents";
   p /= architectureString;
   p /= filename;
   auto hFile = CreateFileW (reinterpret_cast<LPCWSTR> (p.c_str ()), GENERIC_READ, FILE_SHARE_READ,
                             nullptr, OPEN_EXISTING, 0, nullptr);
   if (hFile != INVALID_HANDLE_VALUE)
   {
      CloseHandle (hFile);
      return true;
   }
   return false;
}
 
//------------------------------------------------------------------------
bool isFolderSymbolicLink (const filesystem::path& p)
{
#if USE_FILESYSTEM
   if (/*filesystem::exists (p) &&*/ filesystem::is_symlink (p))
      return true;
#else
   std::wstring wString = p.generic_wstring ();
   auto attrib = GetFileAttributesW (reinterpret_cast<LPCWSTR> (wString.c_str ()));
   if (attrib & FILE_ATTRIBUTE_REPARSE_POINT)
   {
      auto hFile = CreateFileW (reinterpret_cast<LPCWSTR> (wString.c_str ()), GENERIC_READ,
                                FILE_SHARE_READ, nullptr, OPEN_EXISTING, 0, nullptr);
      if (hFile == INVALID_HANDLE_VALUE)
         return true;
      else
         CloseHandle (hFile);
   }
#endif
   return false;
}
 
//------------------------------------------------------------------------
Optional<std::string> getKnownFolder (REFKNOWNFOLDERID folderID)
{
   PWSTR wideStr {};
   if (FAILED (SHGetKnownFolderPath (folderID, 0, nullptr, &wideStr)))
      return {};
   return StringConvert::convert (wideStr);
}
 
//------------------------------------------------------------------------
VST3::Optional<filesystem::path> resolveShellLink (const filesystem::path& p)
{
#if USE_FILESYSTEM
   return {filesystem::read_symlink (p)};
#else
#if USE_OLE
   Ole::instance ();
 
   IShellLink* shellLink = nullptr;
   if (!SUCCEEDED (CoCreateInstance (CLSID_ShellLink, nullptr, CLSCTX_INPROC_SERVER,
                                     IID_IShellLink, reinterpret_cast<LPVOID*> (&shellLink))))
      return {};
 
   IPersistFile* persistFile = nullptr;
   if (!SUCCEEDED (
           shellLink->QueryInterface (IID_IPersistFile, reinterpret_cast<void**> (&persistFile))))
      return {};
 
   if (!SUCCEEDED (persistFile->Load (p.wstring ().data (), STGM_READ)))
      return {};
 
   if (!SUCCEEDED (shellLink->Resolve (nullptr, MAKELONG (SLR_NO_UI, 500))))
      return {};
 
   WCHAR resolvedPath[MAX_PATH];
   if (!SUCCEEDED (shellLink->GetPath (resolvedPath, MAX_PATH, nullptr, SLGP_SHORTPATH)))
      return {};
 
   std::wstring longPath;
   longPath.resize (MAX_PATH);
   auto numChars =
       GetLongPathNameW (resolvedPath, const_cast<wchar_t*> (longPath.data ()), MAX_PATH);
   if (!numChars)
      return {};
   longPath.resize (numChars);
 
   persistFile->Release ();
   shellLink->Release ();
 
   return {filesystem::path (longPath)};
#else
   // TODO for ARM
   return {};
#endif
#endif
}
 
//------------------------------------------------------------------------
void findFilesWithExt (const filesystem::path& path, const std::string& ext,
                       Module::PathList& pathList, bool recursive = true)
{
   for (auto& p : filesystem::directory_iterator (path))
   {
#if USE_FILESYSTEM
      filesystem::path finalPath (p);
      if (isFolderSymbolicLink (p))
      {
         if (auto res = resolveShellLink (p))
         {
            finalPath = *res;
            if (!filesystem::exists (finalPath))
               continue;
         }
         else
            continue;
      }
      const auto& cpExt = finalPath.extension ();
      if (cpExt == ext)
      {
         filesystem::path vstPath (finalPath);
         if (checkVST3Package (vstPath))
         {
            pathList.push_back (vstPath.generic_string ());
            continue;
         }
      }
 
      if (filesystem::is_directory (finalPath))
      {
         if (recursive)
            findFilesWithExt (finalPath, ext, pathList, recursive);
      }
      else if (cpExt == ext)
         pathList.push_back (finalPath.generic_string ());
#else
      const auto& cp = p.path ();
      const auto& cpExt = cp.extension ();
      if (cpExt == ext)
      {
         if ((p.status ().type () == filesystem::file_type::directory) ||
             isFolderSymbolicLink (p))
         {
            filesystem::path finalPath (p);
            if (checkVST3Package (finalPath))
            {
               pathList.push_back (finalPath.generic_u8string ());
               continue;
            }
            findFilesWithExt (cp, ext, pathList, recursive);
         }
         else
            pathList.push_back (cp.generic_u8string ());
      }
      else if (recursive)
      {
         if (p.status ().type () == filesystem::file_type::directory)
         {
            findFilesWithExt (cp, ext, pathList, recursive);
         }
         else if (cpExt == ".lnk")
         {
            if (auto resolvedLink = resolveShellLink (cp))
            {
               if (resolvedLink->extension () == ext)
               {
                  if (filesystem::is_directory (*resolvedLink) ||
                      isFolderSymbolicLink (*resolvedLink))
                  {
                     filesystem::path finalPath (*resolvedLink);
                     if (checkVST3Package (finalPath))
                     {
                        pathList.push_back (finalPath.generic_u8string ());
                        continue;
                     }
                     findFilesWithExt (*resolvedLink, ext, pathList, recursive);
                  }
                  else
                     pathList.push_back (resolvedLink->generic_u8string ());
               }
               else if (filesystem::is_directory (*resolvedLink))
               {
                  const auto& str = resolvedLink->generic_u8string ();
                  if (cp.generic_u8string ().compare (0, str.size (), str.data (),
                                                      str.size ()) != 0)
                     findFilesWithExt (*resolvedLink, ext, pathList, recursive);
               }
            }
         }
      }
#endif
   }
}
 
//------------------------------------------------------------------------
void findModules (const filesystem::path& path, Module::PathList& pathList)
{
   if (filesystem::exists (path))
      findFilesWithExt (path, ".vst3", pathList);
}
 
//------------------------------------------------------------------------
Optional<filesystem::path> getContentsDirectoryFromModuleExecutablePath (
    const std::string& modulePath)
{
   filesystem::path path (modulePath);
 
   path = path.parent_path ();
   if (path.filename () != architectureString)
      return {};
   path = path.parent_path ();
   if (path.filename () != "Contents")
      return {};
 
   return Optional<filesystem::path> {std::move (path)};
}
 
//------------------------------------------------------------------------
} // anonymous
 
//------------------------------------------------------------------------
Module::Ptr Module::create (const std::string& path, std::string& errorDescription)
{
   auto _module = std::make_shared<Win32Module> ();
   if (_module->load (path, errorDescription))
   {
      _module->path = path;
      auto it = std::find_if (path.rbegin (), path.rend (),
                              [] (const std::string::value_type& c) { return c == '/'; });
      if (it != path.rend ())
         _module->name = {it.base (), path.end ()};
      return _module;
   }
   return nullptr;
}
 
//------------------------------------------------------------------------
Module::PathList Module::getModulePaths ()
{
   // find plug-ins located in common/VST3
   PathList list;
   if (auto knownFolder = getKnownFolder (FOLDERID_ProgramFilesCommon))
   {
      filesystem::path p (*knownFolder);
      p.append ("VST3");
      findModules (p, list);
   }
 
   // find plug-ins located in VST3 (application folder)
   WCHAR modulePath[MAX_PATH + 1];
   GetModuleFileNameW (nullptr, modulePath, MAX_PATH);
   auto appPath = StringConvert::convert (modulePath);
   filesystem::path path (appPath);
   path = path.parent_path ();
   path = path.append ("VST3");
   findModules (path, list);
 
   return list;
}
 
//------------------------------------------------------------------------
Module::SnapshotList Module::getSnapshots (const std::string& modulePath)
{
   SnapshotList result;
   auto path = getContentsDirectoryFromModuleExecutablePath (modulePath);
   if (!path)
      return result;
 
   *path /= "Resources";
   *path /= "Snapshots";
 
   if (filesystem::exists (*path) == false)
      return result;
 
   PathList pngList;
   findFilesWithExt (*path, ".png", pngList, false);
   for (auto& png : pngList)
   {
      filesystem::path p (png);
      auto filename = p.filename ().generic_string ();
      auto uid = Snapshot::decodeUID (filename);
      if (!uid)
         continue;
      auto scaleFactor = 1.;
      if (auto decodedScaleFactor = Snapshot::decodeScaleFactor (filename))
         scaleFactor = *decodedScaleFactor;
 
      Module::Snapshot::ImageDesc desc;
      desc.scaleFactor = scaleFactor;
      desc.path = std::move (png);
      bool found = false;
      for (auto& entry : result)
      {
         if (entry.uid != *uid)
            continue;
         found = true;
         entry.images.emplace_back (std::move (desc));
         break;
      }
      if (found)
         continue;
      Module::Snapshot snapshot;
      snapshot.uid = *uid;
      snapshot.images.emplace_back (std::move (desc));
      result.emplace_back (std::move (snapshot));
   }
   return result;
}
 
//------------------------------------------------------------------------
} // Hosting
} // VST3